baber/WOPTO huggingface dataset:
Patent JP-H052729-B2 (JP)
IPC: C21D9/56
Filed: 1987-12-26
Abstract: PURPOSE:To stably run a strip while preventing snaking of the strip without developing contraction or buckling at low cost by pushing the strip with an auxiliary roll having recessed crown in inlet side of the strip for passing roll. CONSTITUTION:In the inlet side of the strip 2 for hearth roll 1 in a strip continuous line for vertical furnace, the strip 2 is pushed by using the auxiliary roll 3 having recessed crown. By this method, tension of the strip 2 at outside increasing with snaking is reduced and the snaking of the strip 2 toward center of the auxiliary roll 3 is corrected. The above auxiliary roll 3 is desirable to be 0<(d-d0)/(l-l0)<1.0X10<-2>, 0<l0<Wmin, 1/10D<d0 (wherein, d: diameter at both end side of the auxiliary roll 3, d0: diameter at center part of the auxiliary roll 3, l: effective length of the auxiliary roll 3, l0: length of straight part at center of the auxiliary roll 3, D: diameter of the hearth roll 1, Wmin: the min. width of the strip 2). Further, the tension of the strip 3 is desirable to be about 0.3-2.0kg/mm<2>.
Patent JP-3563314-B2 (JP)
IPC: B60L50/16
Filed: 1999-11-25
Granted: 2004-09-08
Abstract: PROBLEM TO BE SOLVED: To provide an autocruise control device of a hybrid vehicle which enables constant speed running by applying load change to an engine as small as possible. SOLUTION: A hybrid vehicle can use either engine output or motor output or both of them as a driving force of the vehicle, and is equipped with a battery storing regenerative energy obtained by regenerative operation of a motor. In an autocruise control device of the hybrid vehicle, when a target speed of the vehicle is set by the will of a driver, an engine is driven and assisted by the motor in accordance with the state of a road surface, or the target speed is maintained by regenerative operation of the motor.
Patent JP-4065037-B2 (JP)
IPC: C07C403/14
Filed: 1995-12-04
Granted: 2008-03-19
Abstract: Prodn. of a beta-keto-polyene alcohol of formula A-CH=CH-A' (Ia) or A'-CH=CH-B-CH=CH-A' (Ib) comprises reaction of a polyene aldehyde of formula A-CHO (IIa) or OHC-B-CHO (IIb) with a cyclocarbonate of formula (III) under basic conditions. A' = CO-CR1R2OH; A, B = opt. substd. conjugated polyene mono- or dialdehyde devoid of terminal CHO gp(s).; R1 = 1-6C alkyl; R2 = 1-6C alkyl or 2-6C alkenyl; or R<1>+R<2> = 1,4-tetramethylene or 1,5-pentamethylene. Beta-keto-polyene alcohols of formula R'-CH=CH-CO-C(CH3)2OH (Ic) and R"-CH=CH-CO-CR11R12OH (Id) are new. R', R" = gp. of formula a), b) or c); R, R4 = H, opt. protected OH or oxo; R5 in (Ic) = protected CHO or 4-hydroxy-4-methyl-3-oxo-1-pentyl; R5 in (Id) = protected CHO or CH=CH-A'; m = 0-4; n = 0 or 1; p, r = 0-2; q = 0-3; cpds. (Ic) are excluded when: i) R' = a), m = 2 or 3, R3 = H or opt. protected oxo, R4 = H and n = 0; ii) R' = a), m = 3, R3 = opt. protected OH, R4 = H or opt. protected oxo and n = 0; iii) R' = b), q = 3, p = 2 and n = 0; and iv) R' = c), r = 2 and n = 0; and cpds. (Id) are excluded when R6 = CH=CH-A' and R1 = R2 = Me.
Patent JP-3076050-B2 (JP)
IPC: A61K/
Filed: 1989-12-27
Granted: 2000-08-14
Abstract: The invention is concerned with a polypeptide of Eimeria tenella which can be used for the immunization of chickens against coccidiosis. The invention also relates to a nucleic acid sequence encoding such a polypeptide. Said nucleic acid sequence is especially useful for the preparation of vector vaccines.
Patent JP-4103149-B2 (JP)
IPC: C07D233/68
Filed: 1996-12-24
Granted: 2008-06-18
Abstract: Preparation of substituted imidazole-4-carboxaldehydes of formula (I) comprises: (a) reacting glycine with imido ester of formula RC(=NH)OR1 (II) to give acid derivatives of formula RC(=NH)NHCH2COOH (III); and (b) reacting (III) with Vilsmeier reagent prepared from a chlorinating agent and a formamide of formula R2R3N-CHO (IV) to give (I). R = H, alkyl, alkenyl, cycloalkyl, aralkyl or aryl; R1 = alkyl; and R2, R3 = 1-4C alkyl or aryl.
Patent JP-3896435-B2 (JP)
IPC: B01L3/00
Filed: 1997-12-17
Granted: 2007-03-22
Abstract: A sensor includes an analyzing part (2, 3) and a passage (1) having two ends. One end of the passage (1) is connected to the analyzing part (2, 3). The other end of the passage (1) is closed before use so that the inside of the passage (1) and the analyzing part (2,3) is sealed to prevent a contact with the outside. When the sensor is to be used, the other end of the passage (1) is opened so as to provide an inlet (9) for a sample. <IMAGE>
Patent JP-4088346-B2 (JP)
IPC: H01L41/22
Filed: 1997-05-30
Granted: 2008-05-21
Abstract: An electrode is formed on a substrate such as a varistor, a PTC ceramic, or a piezoelectric ceramic by coating a surface of the substrate with a combination of a metal source and a source of reducing carbon. The substrate and/or the combination is an absorber of microwave radiation. Irradiation with microwave radiation causes a carbothermic reduction to occur, converting the metal source to a metal electrode on the substrate.
Patent JP-H0712317-B2 (JP)
IPC: C12N15/18
Filed: 1987-12-28
Abstract: High protein content feed or synthetic steroids are used to elevate the efficiency of feed and promote pig growth. However, the steroids are not metabolized quickly but remain in the body for a long time and may have a detrimental influence on humans. The invention relates to a method for the production of porcine growth hormone which improves the growth of pigs and the efficiency of feed using a synthetic gene in yeast cells. It has been found that porcine growth hormone may be produced economically and in bulk in yeast by gene manipulation technology.
Patent JP-H0763277-B2 (JP)
IPC: A01N63/30
Filed: 1990-11-19
Abstract: A method and compositions for stimulating the growth of vesicular-arbuscular mycorrhizal fungi alone or in the presence of a plant material using isoflavonoid compounds is described. The isoflavonoids are preferably of the formula:   <IMAGE>   wherein R1, R2 and R3 are selected from the group consisting of hydrogen, hydroxyl and alkoxy, particularly methoxy.
Patent JP-2811341-B2 (JP)
IPC: C07D285/12
Filed: 1989-02-28
Granted: 1998-10-15
Abstract: Heterocyclic 1,2-difluorobenzene derivatives of the formula I <IMAGE>  in which R1 and R2, in each case independently of one another, are an alkyl groups (sic) having 1-15 C atoms in which, in addition, one or more CH2 groups may be replaced by a divalent radical selected from the group comprising -O-, -S-, -CO-, -O-CO-, -CO-O-, -CH=CH- and -C 3BOND C-, where two heteroatoms are not linked directly to one another, A1 and A2, in each case independently of one another, are a 1,4-phenylene group which is unsubstituted or monosubstituted or polysubstituted by fluorine, and in which, in addition, one or two CH groups may be replaced by N, or are a 1,3,4-thiadiazole-2,5-diyl group or a trans-1,4-cyclohexylene group, m and n are each 0 or 2, o is 0 or 1, and p is 0, 1 or 2, where (o+p) is 1, 2 or 3 and, in the case where p=2, the A2 groups and n may be identical or different with the proviso that at least one of the groups A1 and A2 is a 1,3,4-thiadiazole-2,5-diyl group or an unsubstituted or substituted 1,4-phenylene group in which one or two CH groups have been replaced by N, are suitable as components of liquid-crystalline phases.
Patent JP-3043802-B2 (JP)
IPC: C07D493/04
Filed: 1990-02-23
Granted: 2000-05-22
Abstract: Compounds that are analogs of etoposide and exhibit antitumor activity are disclosed. The compounds of the present invention have formula (I), where R1 is  beta -OCH2CH2NH2,  beta -NHCH(CH3)CH2OH, beta -NHCH2CH(CH3)OH,  beta -Cl,  beta -Br,  beta -OH,  alpha -OH, beta -NH2,  alpha -NH2,  beta -NHCH2CH2OH,  alpha -NHCH2CH2OH,  beta -NHCH2CH2CH3,  beta -NHCH2CH2OCH3,  beta -NHCH2CH=CH2,  beta -NHCH2CH(OH)CH3,  beta -NHCH2CH2CH2OH,  beta -OCH2CH2OH, (a), (b), (c), (d), (e), (f), (g), (h), (i), (j), (k), (l), (m), (n), (o), (p), (q), (r), (s), (t), (u), (v) or (w). R2 is H, or Br; R3 is H, or Br; R4 is H, or Br; R5 is H, or Br; and R6 is H, or -CH3.
Patent JP-2667693-B2 (JP)
IPC: G03B42/04
Filed: 1988-05-09
Granted: 1997-10-27
Abstract: PCT No. PCT/EP88/00402 Sec. 371 Date Nov. 8, 1989 Sec. 102(e) Date Nov. 8, 1989 PCT Filed May 9, 1988 PCT Pub. No. WO88/09001 PCT Pub. Date Nov. 17, 1988.Method and apparatus for use in X-ray cassette unloading and loading apparatus, including novel detection of presence or absence of film in the cassette and the position thereof in the upper or lower cassette part, utilizing radiation, such as infra-red, to which the film is not sensitive. Radiation is directed into each cassette part after opening and the radiation reflected from the respective parts is compared. The radiation means, as well as means for holding the cassette parts in open position and air jet means for releasing film from the upper cassette portion, are all mounted on parallelly moving guide members which engage the lateral edges of the cassette to position it.
Patent JP-3257677-B2 (JP)
IPC: C07B59/00
Filed: 1993-07-08
Granted: 2002-02-18
Abstract: PCT No. PCT/EP93/01993 Sec. 371 Date Jan. 6, 1995 Sec. 102(e) Date Jan. 6, 1995 PCT Filed Jan. 6, 1995 PCT Pub. No. WO94/02462 PCT Pub. Date Feb. 3, 1994.Piperidinyl substituted benzamides of formula cid addition salts thereof and the stereoisomeric forms thereof, wherein R1 is hydrogen or halo; R2 is halo; R3 is hydrogen or halo; R4 and R5 each independently are hydrogen, C1-4alkyl or haloC1-4alkyl; and the group NR4R5 may also be azido, Alk is C2-4alkanediyl; pharmaceutical compositions containing said compounds of formula (I) as active ingredient; use of said compounds as a medicine; process of preparing said compounds; compounds of formula (I) containing a radioactive isotope; process of marking 5HT2-receptor sites; and process for imaging an organ are disclosed.
Patent JP-3147906-B2 (JP)
IPC: A61K31/00
Filed: 1996-06-26
Granted: 2001-03-19
Abstract: 4-Aryl-1-phenyl alkyl-1,2,3,6-tetrahydropyridine derivs. of formula (I), their salts, solvates and quat. ammonium salts are new. Y = CH or N; R1 = H, halo, CF3, 3-4C alkyl or 1-4C alkoxy; R2 = as R1 or OH; R3, R4 = H or 1-3C alkyl; X = 3-6C alkyl, 3-6C alkoxy, 3-7C carboxyalkyl, (1-4C) alkoxycarbonyl(3-6C)alkyl, 3-7C carboxyalkoxy or (1-4C)alkoxycarbonyl(3-6C)alkoxy; or 3-7C cycloalkyl, 3-7C cycloalkoxy, (3-7C)cycloalkylmethyl, 3-7C cycloalkylamino or cyclohexenyl (all opt. substd.); or phenyl, phenoxy, phenylamino, N-(1-3C)alkylphenylamino, phenylmethyl, phenylethyl, phenylcarbonyl, phenylthio, phenylsulphonyl, phenylsulphinyl or styryl (all opt. substd.)
Patent JP-2708165-B2 (JP)
IPC: H01S5/00
Filed: 1987-09-22
Granted: 1998-02-04
Abstract: In a semiconductor buried heterostructure laser, having a mesa 2, 3, 4 and confinement layers 5, 6, 7 on a substrate 12, at least the lowermost of the confinement layers 5, 6, 7 is substantially planar up to the mesa. This is achieved by MOVPE      growth of InP against lateral surfaces of the mesa 2, 3, 4 which are defined by distinct crystallographic planes of the material of the mesa. In particular (111) B InP planes are used. The laser is particularly for use in the field of optical communications.
Patent JP-3402606-B2 (JP)
IPC: C10L1/14
Filed: 1992-09-11
Granted: 2003-05-06
Abstract: A fuel additive composition comprising (a) a polyisobutenyl succinimide derived from ethylenediamine or diethylenetriamine, wherein the polyisobutenyl group has an average molecular weight of about 1200 to 1500 and (b) a nonvolatile paraffinic or naphthenic carrier oil, or a mixture thereof.
Patent JP-H0745519-B2 (JP)
IPC: C07K14/195
Filed: 1986-11-26
Abstract: Murine-derived hybridoma tumor cell lines and monoclonal anti-human pluripotent Granulocyte Colony Stimulating Factor antibody substances produced by these cell lines. Use of said monoclonal antibody substances, alone or in combination, in immunological procedures for isolation of human pluripotent Granulocyte Colony Stimulating Factor and for quantitative detection of human pluripotent Granulocyte Colony Stimulating Factor in fluid samples.
Patent JP-4172045-B2 (JP)
IPC: A61K31/66
Filed: 1994-11-18
Granted: 2008-10-29
Abstract: PCT No. PCT/SE94/01095 Sec. 371 Date Jul. 22, 1996 Sec. 102(e) Date Jul. 22, 1996 PCT Filed Nov. 18, 1994 PCT Pub. No. WO95/14477 PCT Pub. Date Jun. 1, 1995The present invention relates to the use of an ester of inositoltrisphosphate for the preparation of a medicament for preventing, alleviating or combatting inflammatory conditions in mammals including man. Injury or destruction of tissues should be understood as damage to an aggregation of specialized cells with a particular function both internally and externally in the body, such as different organs or parts of these, vessels, skin etc. Tissue damage involves a complex series of events such as dilatation of vessel walls e.g. arterioles, capillaries and venules, increased permeability of fluids including e.g. plasma proteins and increased blood flow. Increased vascular leakage often results in extravasation and oedema formation which characterize the damage of different tissues. Often tissue damage and inflammatory conditions are characterized by signs of pain, heat, redness, swelling and loss of function. Tissue damage is not defined as a disease per se but is often a component in different diseases of both acute or chronic nature.
Patent JP-3014145-B2 (JP)
IPC: A23L11/30
Filed: 1994-12-14
Granted: 2000-02-28
Abstract: An efficient process for producing food, livestock feed and aquacultural feed which are excellent in the effects of preventing and suppressing cancer, treating osteoporosis and suppressing immune responses and can be taken in large quantities from leguminous grains or cakes. The obtained food such as biscuit has the abovementioned excellent pharmacological effects and is good for the health. It is possible to decompose a glycoside of an isoflavone compound contained in pulse to thereby generate an isoflavone compound containing the aglycon and to remove phytic acid present in pulse to thereby obtain a compound having excellent pharmacological effects. <IMAGE>
Patent JP-3386133-B2 (JP)
IPC: B65D71/46
Filed: 1994-12-14
Granted: 2003-03-17
Abstract: A top gripping carrier (11) packaging necked articles such as bottles (B) comprises top (18, 28), side (20, 26) and bottom (22, 24) walls, neck receiving apertures (38) and article retaining means (60) disposed intermediate the bottom and top wall adapted to retain the top of the associated article (B) within the carrier obscured from view from above and from the sides of the carton.
Patent JP-2922648-B2 (JP)
IPC: C07D311/46
Filed: 1994-01-31
Granted: 1999-07-26
Abstract: The present invention provides novel antiviral naphthoquinone compounds, which may be isolated from plants of the genus Conospermum or synthesized chemically, in accordance with the present inventive methods. The antiviral naphthoquionone compounds, derivatives thereof, and prodrugs thereof, may be used alone or in combination with other antiviral agents in compositions, such as pharmaceutical compositions, to inhibit the growth or replication of a virus, such as a retrovirus, in particular a human immunodeficiency virus, specifically HIV-1 or HIV-2, in the treatment or prevention of viral infection.
Patent JP-3816100-B2 (JP)
IPC: C08L79/00
Filed: 1995-11-21
Granted: 2006-08-30
Abstract: PCT No. PCT/EP95/04590 Sec. 371 Date May 30, 1997 Sec. 102(e) Date May 30, 1997 PCT Filed Nov. 21, 1995 PCT Pub. No. WO96/17018 PCT Pub. Date Jun. 6, 1996Impact-resistant thermoplastic molding materials contain A) from 10 to 99.5% by weight of a thermoplastic polymer selected from the group consisting of the polyoxymethylenes, polyolefins, polyesters, polycarbonates, polystyrene, ABS, ASA, SAN, polyamides or poly(meth)acrylates or mixtures thereof, B) from 0.5 to 80% by weight of a thermoplastic polyurethane, C) from 0 to 50% by weight of a fibrous or particulate filler and D) from 0 to 30% by weight of conventional additives and processing assistants, the thermoplastic polyurethane B) containing from 0.05 to 10% by weight, based on B), of a carbodiimide:    <IMAGE>  (I)    <IMAGE>   where R is identical or different and is selected from the group consisting of -NCO-, -NHCONHR1-, -NHCONR1R2- and -NHCOOR3- radicals, where R1 and R2 are identical or different and are an alkyl, cycloalkyl or aralkyl radical and R3 is R1 or an alkoxypolyoxyalkylene radical and n is an integer from 0 to 10.
Patent JP-4015693-B2 (JP)
IPC: A61K47/48
Filed: 1995-02-06
Granted: 2007-11-28
Abstract: The present invention provides a non-viral vector, comprising a cell binding component having a biotin-binding element conjugated to a biotinylated moiety. Also, provided is a method of introducing genetic material inside a specific cell comprising the administration of the non-viral vector to a human, wherein said non-viral vector comprises a cell binding component having a biotin-binding element conjugated to a biotinylated moiety. In addition, there is provided a method of delivering a cytotoxic moiety to a cell comprising the administration of the non-viral vector to a human.
Patent JP-3329822-B2 (JP)
IPC: C12N15/82
Filed: 1996-03-28
Granted: 2002-09-30
Abstract: A novel DNA which has a sequence different from those of publicly known DNAs capable of promoting the expression of an alien gene and can remarkably promote the expression of an alien gene. An isolated DNA fragment having a base sequence represented by SEQ ID NO:1 in the Sequence Listing; and an isolated DNA fragment represented by this base sequence wherein one or more nucleotides have been added, inserted, deleted or replaced and having the effect of promoting the expression of a gene located in the downstream thereof. <IMAGE>
Patent JP-4763104-B2 (JP)
IPC: A61K31/6615
Filed: 1998-02-14
Granted: 2011-08-31
Abstract: Composition for the treatment of infant or adult respiratory distress syndrome (IRDS and ARDS) contains N-(3,5-dichloropyrid-4-yl)-3- cyclopropylmethoxy-4- difluoromethoxybenzamide (II) (and/or its salts) and a lung surfactant.
Patent JP-3506718-B2 (JP)
IPC: C12N5/071
Filed: 1998-05-05
Granted: 2004-03-15
Abstract: The present invention comprises a poly(vinyl alcohol) hydrogel construct having a wide range of mechanical strengths for use as a human tissue replacement. A process in connection with the present invention eliminates any step involved with dehydration of the hydrogel prior to implantation thereof. The hydrogel construct may comprise a tissue scaffolding, a low bearing surface within a joint, or any other structure, which is suitable for supporting the growth of tissue.
Patent MD-2914-B2 (MD)
Inventor: BORTOI TUDOR
IPC: F16J10/00
Filed: 2003-09-02
Abstract: Inventia se refera la galvanotehnica, in particular la procedee si dispozitive de depunere a invelisurilor galvanice compozitionale pe suprafete intracilindrice.Procedeul de depunere a compozitiei galvanice se efectueaza cu mai multi curenti de curgere a suspensiei de electrolit, diferiti ca directie si viteza.Dispozitivul pentru realizarea procedeului revendicat consta dintr-o baie cilindrica (1), o celula constituita dintr-un suport (4) cu orificii (5) in partea superioara si un anod (10), instalat cu posibilitatea de rotire. Partea inferioara a suportului (4) contine o proeminenta pentru fixarea piesei-catod si este realizata in forma de confuzor (6) in care este instalat cu joc, coaxial cu anodul, un tub (7), in interiorul caruia este amplasata o elice axiala (8) a mecanismului de refulare. Un capat al tubului (7) incepe de la anod (10), iar celalalt nu ajunge pana la fundul (2) baii (1). In partea superioara a suportului (4), sub orificii (5), este instalat un difuzor inelar (12), iar pe capatul superior al anodului (10) - un capac izolator (11). Fundul (2) baii (1) este executat in forma de pilnie situata pe axa anodului, intretaiata la centru de un con.Celula, conform variantei intai, contine un anod cilindric cav, optional solubil, amplasat coaxial intr-un suport, anodul solubil este dotat cu un ajutaj de etansare a celulei, care contine un racord de aspirare si cu orificii executate sub un unghi de 30...40î in directie radiala si de 50...60î fata de axa anodului si localizate in partile superioara si inferioara ale anodului. Partea inferioara a suportului contine o proeminenta pentru fixarea piesei-catod si este realizata in forma de confuzor, iar orificiul de jos al anodului este inchis cu un dop cu cap conic. In cazul anodului solubil, acesta este imbracat pe un tub insolubil care are segmente inelare cu orificii repartizate in partea de jos si de sus a tubului.Celula, conform variantei a doua, comparativ cu prima varianta, contine un anod optional solubil, cu orificii executate si sub un unghi de 120...130î fata de axa anodului si localizate in partile lui de mijloc si superioara. Partile inferioare ale suportului si anodului sunt prelungite corespunzator cu un confuzor si o palnie, iar spatiul intraanodic este divizat la mijloc si intre orificii de un dop.
Patent PL-162289-B2 (PL)
Title: Device for detrmining and recording ataxia and other extremity movement disorders, especially of lower human extremities s
Inventor: WESTERSKI WLODZIMIERZ
IPC: A61B5/103
Filed: 1990-10-12
Abstract: Device for determination and recording of ataxia and other disorders of movement of limbs, in particular the human lower limbs, containing two slider elements capable of relative movement situated along the body of the patient and performing measurement functions relating to parameters of the patient's limbs, characterized in that it consists of an elastic lower band (1) fastened on the ankle joint of the patient, having a lower distance slider sleeve (2) fastened rigidly to the band at a right angle relative to the axis of the tested limb, while mounted detachably in the sleeve, so as to allow rotation and sliding movement, is a lower intermediate pin (3), whose free end is connected, preferably non-detachably, in a lower articulated joint (4) which has at least two degrees of freedom of movement and is fastened rigidly on the outer end of a slider sleeve (5), inside which is a slide-fitting telescopic plunger (6), which has fastened close to its free end a similarly constructed upper articulated joint (7) with at least two degrees of freedom of movement, mounted in which is an upper intermediate pin (8), which slides in and has a detachable connection with an upper distance slider sleeve (9), which is fastened rigidly, at a right angle relative to the axis of the tested limb, to an upper elastic band (10) fastened on the patient's hip or shoulder, while at the end of the plunger (6), beyond the point where the upper articulated joint (7) is fixed, is a permanent magnet (12) fastened rigidly on an angular extension arm (11) at a right angle relative to the tested limb, the magnet being mounted slidably inside a special induction coil (13) connected by an elastic cable (14) to an x-t graphic recorder (15).<IMAGE>
Patent ES-2192451-B2 (ES)
Title: Mejoras en el objeto de la patente de invencion p 200001958 por "dispositivo para apertura de zanjas estrechas y colocacion de elementos prefabricados machiembrados.
Inventor: GOMEZ PEREZ EDUARDO
IPC: E02F5/10
Filed: 2001-06-13
Granted: 2004-09-16
Abstract: Mejoras en el objeto de la patente de invención P200001958 por "dispositivo para apertura de zanjas estrechas y colocación de elementos prefabricados machihembrados". Una primera mejora consiste en la utilización de un alimentador giratorio paso a paso (51) constituido por dos discos (52) unidos por un eje central (53) sobre los que se fijan una pluralidad de pletinas alveolares (54) así como una rueda dentada (55) susceptible de ser inmovilizada por un cerrojo (56) movilizable mediante un actuador neumático (57) controlado por un interruptor (58) provisto de un palpador (59). Una segunda mejora consiste en que cuando los elementos prefabricados machihembrados (33) presentan la forma de canaletas de sección transversal en "U" la rueda de empuje (7) presenta el mismo ancho del canal central de la "U". Una tercera mejora consiste en que entre cada dos elementos prefabricados machihembrados (33) sucesivos se intercalan separadores (60), realizados en un material de menor dureza, con objeto deimpedir su contacto directo.